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502 lines
23 KiB
HTML
502 lines
23 KiB
HTML
2 weeks ago
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<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=Edge">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<script>
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var gaProperty = 'UA-2577926-1';
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// Disable tracking if the opt-out cookie exists.
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var disableStr = 'ga-disable-' + gaProperty;
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if (document.cookie.indexOf(disableStr + '=true') > -1) {
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window[disableStr] = true;
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}
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function gaOptout() {
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document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = true;
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}
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function gaOptoutRevoke() {
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document.cookie = disableStr + '=false; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = false;
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}
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</script>
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<!-- Global site tag (gtag.js) - Google Analytics -->
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<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2577926-1"></script>
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<script>
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
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</script>
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<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
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<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
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<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
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<script>
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window.addEventListener("load", function() {
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window.cookieconsent.initialise({
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'palette': {
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'popup': {
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'background': '#eaf7f7',
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'text': '#5c7291'
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},
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'button': {
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'background': '#56cbdb',
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'text': '#ffffff'
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}
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},
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'theme': 'edgeless',
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'type': 'opt-out',
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'onInitialise': function (status) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onStatusChange': function(status, chosenBefore) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onRevokeChoice': function() {
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gaOptoutRevoke()
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}
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})
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});
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</script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
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<link rel="stylesheet" href="./css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="https://unpkg.com/elm-pep"></script>
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<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
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<link rel="stylesheet" href="region-growing.css">
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<title>Region Growing</title>
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</head>
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<body>
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<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
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<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt=""> OpenLayers</a>
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
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<span class="navbar-toggler-icon"></span>
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</button>
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<!-- menu items that get hidden below 768px width -->
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<nav class="collapse navbar-collapse" id="olmenu">
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<ul class="nav navbar-nav ml-auto">
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<li class="nav-item dropdown">
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<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
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<a class="dropdown-item" href="../doc/">Docs</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
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<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
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<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
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<a class="dropdown-item" href="/workshop/"><i class="fa fa-graduation-cap fa-fw mr-2 fa-lg"></i>Workshop</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
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</div>
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</li>
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<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
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<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
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<li class="nav-item dropdown">
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<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
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<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
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<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
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</div>
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</li>
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</ul>
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</nav>
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</header>
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<div class="container-fluid line-numbers">
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<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
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<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
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This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
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</div>
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<div class="row-fluid">
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<a href="#" id="codepen-button" class="btn btn-link float-right">
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<i class="fa fa-codepen fa-lg"></i> Edit
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</a>
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<div class="span12">
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<h4 id="title">Region Growing</h4>
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<p class="tags">
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<span class="badge-group">
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<a
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href="./index.html?q=raster" class="badge badge-info">raster</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="raster"
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data-content="
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<a class="list-group-item list-group-item-action" href="./raster.html">Raster Source</a>
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<a class="list-group-item list-group-item-action active" href="./region-growing.html">Region Growing</a>
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<a class="list-group-item list-group-item-action" href="./sea-level.html">Sea Level</a>
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<a class="list-group-item list-group-item-action" href="./shaded-relief.html">Shaded Relief</a>"
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tabindex="0"
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>4</a>
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</span>
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<span class="badge-group">
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<a
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href="./index.html?q=regiongrowing" class="badge badge-info">regiongrowing</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="regiongrowing"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./region-growing.html">Region Growing</a>"
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tabindex="0"
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>1</a>
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</span>
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<span class="badge-group">
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<a
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href="./index.html?q=maptiler" class="badge badge-info">maptiler</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="maptiler"
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data-content="
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<a class="list-group-item list-group-item-action" href="./zoom-constrained.html">Constrained Zoom</a>
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<a class="list-group-item list-group-item-action" href="./drag-and-drop.html">Drag-and-Drop</a>
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<a class="list-group-item list-group-item-action" href="./drag-and-drop-image-vector.html">Drag-and-Drop Image Vector</a>
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<a class="list-group-item list-group-item-action" href="./full-screen.html">Full Screen Control</a>
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<a class="list-group-item list-group-item-action" href="./full-screen-drag-rotate-and-zoom.html">Full Screen Drag, Rotate, and Zoom</a>
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<a class="list-group-item list-group-item-action" href="./gpx.html">GPX Data</a>
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<a class="list-group-item list-group-item-action" href="./image-filter.html">Image Filters</a>
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<a class="list-group-item list-group-item-action" href="./interpolation.html">Interpolation</a>
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<a class="list-group-item list-group-item-action" href="./kml.html">KML</a>
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<a class="list-group-item list-group-item-action" href="./layer-spy.html">Layer Spy</a>
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<a class="list-group-item list-group-item-action" href="./layer-swipe.html">Layer Swipe</a>
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<a class="list-group-item list-group-item-action" href="./magnify.html">Magnify</a>
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<a class="list-group-item list-group-item-action" href="./mapbox-layer.html">Mapbox-gl Layer</a>
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<a class="list-group-item list-group-item-action" href="./feature-move-animation.html">Marker Animation</a>
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<a class="list-group-item list-group-item-action" href="./vector-osm.html">OSM XML</a>
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<a class="list-group-item list-group-item-action" href="./raster.html">Raster Source</a>
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<a class="list-group-item list-group-item-action active" href="./region-growing.html">Region Growing</a>
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<a class="list-group-item list-group-item-action" href="./side-by-side.html">Shared Views</a>
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<a class="list-group-item list-group-item-action" href="./street-labels.html">Street Labels</a>
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<a class="list-group-item list-group-item-action" href="./mapbox-style.html">Vector tiles created from a Mapbox Style object</a>
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<a class="list-group-item list-group-item-action" href="./vector-tiles-4326.html">Vector tiles in EPSG:4326</a>
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<a class="list-group-item list-group-item-action" href="./vector-wfs.html">WFS</a>
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<a class="list-group-item list-group-item-action" href="./vector-wfs-getfeature.html">WFS - GetFeature</a>
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<a class="list-group-item list-group-item-action" href="./vector-wfs-geographic.html">WFS with geographic coordinates</a>
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<a class="list-group-item list-group-item-action" href="./xyz-retina.html">XYZ Retina Tiles</a>"
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tabindex="0"
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>25</a>
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</span>
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</p>
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<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
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<div class="modal-dialog modal-dialog-scrollable" role="document">
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<div class="modal-content">
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<div class="modal-header">
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<h5 class="modal-title" id="tag-example-title"></h5>
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<button type="button" class="close" data-dismiss="modal" aria-label="Close">
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<span aria-hidden="true">×</span>
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</button>
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</div>
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<div class="modal-body">
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<div class="list-group"></div>
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</div>
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</div>
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</div>
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</div>
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<div id="map" class="map"></div>
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<div>
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<label class="input-group">
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Threshold:
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<input id="threshold" type="range" min="1" max="50" value="20">
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<span id="threshold-value"></span>
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</label>
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</div>
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</div>
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<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
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<input id="codesandbox-params" type="hidden" name="parameters">
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</form>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<p id="shortdesc">Grow a region from a seed pixel</p>
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<div id="docs"><p>Click a region on the map. The computed region will be red.</p> <p>
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This example uses a <code>ol/source/Raster</code> to generate data
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based on another source. The raster source accepts any number of
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input sources (tile or image based) and runs a pipeline of
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operations on the input data. The return from the final
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operation is used as the data for the output source.
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</p> <p>
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In this case, a single tiled source of imagery data is used as input.
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The region is calculated in a single "image" operation using the "seed"
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pixel provided by the user clicking on the map. The "threshold" value
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determines whether a given contiguous pixel belongs to the "region" - the
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difference between a candidate pixel's RGB values and the seed values must
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be below the threshold.
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</p> <p>
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This example also shows how an additional function can be made available
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to the operation.
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</p>
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</div>
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</div>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">main.js</h5>
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<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
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import Map from 'ol/Map';
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import RasterSource from 'ol/source/Raster';
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import View from 'ol/View';
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import XYZ from 'ol/source/XYZ';
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import {Image as ImageLayer, Tile as TileLayer} from 'ol/layer';
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import {fromLonLat} from 'ol/proj';
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function growRegion(inputs, data) {
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const image = inputs[0];
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let seed = data.pixel;
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const delta = parseInt(data.delta);
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if (!seed) {
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return image;
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}
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seed = seed.map(Math.round);
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const width = image.width;
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const height = image.height;
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const inputData = image.data;
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const outputData = new Uint8ClampedArray(inputData);
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const seedIdx = (seed[1] * width + seed[0]) * 4;
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const seedR = inputData[seedIdx];
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const seedG = inputData[seedIdx + 1];
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const seedB = inputData[seedIdx + 2];
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let edge = [seed];
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while (edge.length) {
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const newedge = [];
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for (let i = 0, ii = edge.length; i < ii; i++) {
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// As noted in the Raster source constructor, this function is provided
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// using the `lib` option. Other functions will NOT be visible unless
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// provided using the `lib` option.
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const next = next4Edges(edge[i]);
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for (let j = 0, jj = next.length; j < jj; j++) {
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const s = next[j][0];
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||
|
|
const t = next[j][1];
|
||
|
|
if (s >= 0 && s < width && t >= 0 && t < height) {
|
||
|
|
const ci = (t * width + s) * 4;
|
||
|
|
const cr = inputData[ci];
|
||
|
|
const cg = inputData[ci + 1];
|
||
|
|
const cb = inputData[ci + 2];
|
||
|
|
const ca = inputData[ci + 3];
|
||
|
|
// if alpha is zero, carry on
|
||
|
|
if (ca === 0) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (
|
||
|
|
Math.abs(seedR - cr) < delta &&
|
||
|
|
Math.abs(seedG - cg) < delta &&
|
||
|
|
Math.abs(seedB - cb) < delta
|
||
|
|
) {
|
||
|
|
outputData[ci] = 255;
|
||
|
|
outputData[ci + 1] = 0;
|
||
|
|
outputData[ci + 2] = 0;
|
||
|
|
outputData[ci + 3] = 255;
|
||
|
|
newedge.push([s, t]);
|
||
|
|
}
|
||
|
|
// mark as visited
|
||
|
|
inputData[ci + 3] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
edge = newedge;
|
||
|
|
}
|
||
|
|
return {data: outputData, width: width, height: height};
|
||
|
|
}
|
||
|
|
|
||
|
|
function next4Edges(edge) {
|
||
|
|
const x = edge[0];
|
||
|
|
const y = edge[1];
|
||
|
|
return [
|
||
|
|
[x + 1, y],
|
||
|
|
[x - 1, y],
|
||
|
|
[x, y + 1],
|
||
|
|
[x, y - 1],
|
||
|
|
];
|
||
|
|
}
|
||
|
|
|
||
|
|
const key = 'Get your own API key at https://www.maptiler.com/cloud/';
|
||
|
|
const attributions =
|
||
|
|
'<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
|
||
|
|
'<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
|
||
|
|
|
||
|
|
const imagery = new TileLayer({
|
||
|
|
source: new XYZ({
|
||
|
|
attributions: attributions,
|
||
|
|
url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
|
||
|
|
maxZoom: 20,
|
||
|
|
crossOrigin: '',
|
||
|
|
}),
|
||
|
|
});
|
||
|
|
|
||
|
|
const raster = new RasterSource({
|
||
|
|
sources: [imagery.getSource()],
|
||
|
|
operationType: 'image',
|
||
|
|
operation: growRegion,
|
||
|
|
// Functions in the `lib` object will be available to the operation run in
|
||
|
|
// the web worker.
|
||
|
|
lib: {
|
||
|
|
next4Edges: next4Edges,
|
||
|
|
},
|
||
|
|
});
|
||
|
|
|
||
|
|
const rasterImage = new ImageLayer({
|
||
|
|
opacity: 0.7,
|
||
|
|
source: raster,
|
||
|
|
});
|
||
|
|
|
||
|
|
const map = new Map({
|
||
|
|
layers: [imagery, rasterImage],
|
||
|
|
target: 'map',
|
||
|
|
view: new View({
|
||
|
|
center: fromLonLat([-119.07, 47.65]),
|
||
|
|
zoom: 11,
|
||
|
|
}),
|
||
|
|
});
|
||
|
|
|
||
|
|
let coordinate;
|
||
|
|
|
||
|
|
map.on('click', function (event) {
|
||
|
|
coordinate = event.coordinate;
|
||
|
|
raster.changed();
|
||
|
|
});
|
||
|
|
|
||
|
|
const thresholdControl = document.getElementById('threshold');
|
||
|
|
|
||
|
|
raster.on('beforeoperations', function (event) {
|
||
|
|
// the event.data object will be passed to operations
|
||
|
|
const data = event.data;
|
||
|
|
data.delta = thresholdControl.value;
|
||
|
|
if (coordinate) {
|
||
|
|
data.pixel = map.getPixelFromCoordinate(coordinate);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
function updateControlValue() {
|
||
|
|
document.getElementById('threshold-value').innerText = thresholdControl.value;
|
||
|
|
}
|
||
|
|
updateControlValue();
|
||
|
|
|
||
|
|
const listener = function () {
|
||
|
|
updateControlValue();
|
||
|
|
raster.changed();
|
||
|
|
};
|
||
|
|
thresholdControl.addEventListener('input', listener);
|
||
|
|
thresholdControl.addEventListener('change', listener);
|
||
|
|
</code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">index.html</h5>
|
||
|
|
<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>Region Growing</title>
|
||
|
|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
|
||
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
||
|
|
<!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x -->
|
||
|
|
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
|
||
|
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
|
||
|
|
<style>
|
||
|
|
.map {
|
||
|
|
width: 100%;
|
||
|
|
height:400px;
|
||
|
|
}
|
||
|
|
.map {
|
||
|
|
cursor: pointer;
|
||
|
|
}
|
||
|
|
#threshold {
|
||
|
|
margin: 0 0.6em;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div id="map" class="map"></div>
|
||
|
|
<div>
|
||
|
|
<label class="input-group">
|
||
|
|
Threshold:
|
||
|
|
<input id="threshold" type="range" min="1" max="50" value="20">
|
||
|
|
<span id="threshold-value"></span>
|
||
|
|
</label>
|
||
|
|
</div>
|
||
|
|
<script src="main.js"></script>
|
||
|
|
</body>
|
||
|
|
</html></code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">package.json</h5>
|
||
|
|
<pre><code id="example-pkg-source" class="language-json">{
|
||
|
|
"name": "region-growing",
|
||
|
|
"dependencies": {
|
||
|
|
"ol": "6.12.0"
|
||
|
|
},
|
||
|
|
"devDependencies": {
|
||
|
|
"parcel": "^2.0.0"
|
||
|
|
},
|
||
|
|
"scripts": {
|
||
|
|
"start": "parcel index.html",
|
||
|
|
"build": "parcel build --public-url . index.html"
|
||
|
|
}
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
|
||
|
|
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
|
||
|
|
<script src="./resources/prism/prism-1.20.0.min.js"></script>
|
||
|
|
<script src="./resources/common.js"></script>
|
||
|
|
<script src="common.js"></script>
|
||
|
|
<script src="region-growing.js"></script>
|
||
|
|
<script>
|
||
|
|
$('#tag-example-list').on('show.bs.modal', function (event) {
|
||
|
|
const button = $(event.relatedTarget); // Button that triggered the modal
|
||
|
|
const title = button.data('title');
|
||
|
|
const content = button.data('content');
|
||
|
|
const modal = $(this)
|
||
|
|
modal.find('.modal-title').text(title);
|
||
|
|
modal.find('.modal-body').html(content);
|
||
|
|
});
|
||
|
|
|
||
|
|
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
|
||
|
|
fetch(packageUrl).then(function(response) {
|
||
|
|
return response.json();
|
||
|
|
}).then(function(json) {
|
||
|
|
var latestVersion = json.version;
|
||
|
|
document.getElementById('latest-version').innerHTML = latestVersion;
|
||
|
|
var url = window.location.href;
|
||
|
|
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
|
||
|
|
var cookieText = 'dismissed=-' + latestVersion + '-';
|
||
|
|
var dismissed = document.cookie.indexOf(cookieText) != -1;
|
||
|
|
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
|
||
|
|
var link = url.replace(branchSearch[0], '/latest/examples/');
|
||
|
|
fetch(link, {method: 'head'}).then(function(response) {
|
||
|
|
var a = document.getElementById('latest-link');
|
||
|
|
a.href = response.status == 200 ? link : '../../latest/examples/';
|
||
|
|
});
|
||
|
|
var latestCheck = document.getElementById('latest-check');
|
||
|
|
latestCheck.style.display = '';
|
||
|
|
document.getElementById('latest-dismiss').onclick = function() {
|
||
|
|
latestCheck.style.display = 'none';
|
||
|
|
document.cookie = cookieText;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
</script>
|
||
|
|
</body>
|
||
|
|
</html>
|